Capital of new ireland

I think there may be a bit of confusion here!

There is no country called "New Ireland". Ireland is a country located in Northwest Europe, and its capital is Dublin.

However, there is a region called Northern Ireland, which is part of the United Kingdom (UK) and is located on the island of Ireland. The capital of Northern Ireland is Belfast.

If you meant something else, please let me know and I'll do my best to help!